True. But women sometimes notice things amiss, that a man might not notice. If I had been away on a trip, and I came back home in the middle of the night, and laid down on our bed, if I smelled perfume on the sheets, or saw a lipstick streak on my pillowcase, I'd freak out. And I bet my husband wouldn't have even noticed something like that...
I learned those things from hiding relations in High School... haha.
If you are away on a trip... I am sure all he does is miss you.